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Engine Overhaul Manual
Jabiru Aircraft
Pty Ltd
Jabiru 2200 & 3300 Aircraft Engines
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ISSUE
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6 7
Dated : 28/10/2014
Issued By: AS
Page: 104 of 201
L:\files\Manuals_For_Products\Engine_Manuals\Overhaul_Manual\JEM0001-7_Overhaul_Manual_DRAFT_(29_10_14).docx
7.2 Subassembly B
– Crankcase and camshaft
7.2.1 Crankcase
Figure 121
– Crankcase Assembly Preparation
Lubricate and fit the O rings to the bottom main bearing stud holes (arrowed in Figure 121 - left) and
then fit the front and rear crankcase studs using Loctite 620 Retainer: clean and prime the threads first
using Loctite 7471 cure accelerator. Use a collet type stud tool to screw the 2 short front crankcase
studs to a free length of 52mm and the 2 long front and the 2 rear crankcase studs to a free length of
95mm as shown in Figure 121. Note: Later longer studs are positioned 54mm and 97mm free length
above the crankcase join.
Fit the hollow dowels to one crankcase half in the positions arrowed above. It is vital that poorly fitted
dowels are not used at the crankcase join
– if the dowels can be pushed in by hand then they are too
loose. The correct fit it a light “tap” fit using a soft hammer. Oversize dowels are available to ensure a
snug fit. These are identified by “dots” machined into them as shown in Figure 122 – the standard size
has no dots then the size increases progressively up to the 3-dot dowel which is the largest size
available. Experience in Australia has shown that 1-dot dowels are suitable for most overhauled
engines with 2-dot and 3-dot parts being used very occasionally.
The overhauler may opt to fit somewhat loose-fitting dowels for temporary assembly of the engine to
measure bearing sizes. This simplifies sebsequent disassembly. Where such parts are used they must
be clearly marked so that they are not fitted to an engine during final assembly by mistake.
WARNING
Ensure correct size dowels are used for final assembly.
Figure 122
– Crankcase Dowels
Short front crankcase studs: 52mm min
Long front and rear crankcase studs: 95mm min